/*!
 * vue-router v3.5.3
 * (c) 2021 Evan You
 * @license MIT
 */
(function (global, factory) {
  typeof exports === "object" && typeof module !== "undefined"
    ? (module.exports = factory())
    : typeof define === "function" && define.amd
    ? define(factory)
    : ((global =
        typeof globalThis !== "undefined" ? globalThis : global || self),
      (global.VueRouter = factory()));
})(this, function () {
  "use strict";

  /*  */

  function assert(condition, message) {
    if (!condition) {
      throw new Error("[vue-router] " + message);
    }
  }

  function warn(condition, message) {
    if (!condition) {
      typeof console !== "undefined" && console.warn("[vue-router] " + message);
    }
  }

  function extend(a, b) {
    for (var key in b) {
      a[key] = b[key];
    }
    return a;
  }

  /*  */

  var encodeReserveRE = /[!'()*]/g;
  var encodeReserveReplacer = function (c) {
    return "%" + c.charCodeAt(0).toString(16);
  };
  var commaRE = /%2C/g;

  // fixed encodeURIComponent which is more conformant to RFC3986:
  // - escapes [!'()*]
  // - preserve commas
  var encode = function (str) {
    return encodeURIComponent(str)
      .replace(encodeReserveRE, encodeReserveReplacer)
      .replace(commaRE, ",");
  };

  function decode(str) {
    try {
      return decodeURIComponent(str);
    } catch (err) {
      {
        warn(false, 'Error decoding "' + str + '". Leaving it intact.');
      }
    }
    return str;
  }

  function resolveQuery(query, extraQuery, _parseQuery) {
    if (extraQuery === void 0) extraQuery = {};

    var parse = _parseQuery || parseQuery;
    var parsedQuery;
    try {
      parsedQuery = parse(query || "");
    } catch (e) {
      warn(false, e.message);
      parsedQuery = {};
    }
    for (var key in extraQuery) {
      var value = extraQuery[key];
      parsedQuery[key] = Array.isArray(value)
        ? value.map(castQueryParamValue)
        : castQueryParamValue(value);
    }
    return parsedQuery;
  }

  var castQueryParamValue = function (value) {
    return value == null || typeof value === "object" ? value : String(value);
  };

  function parseQuery(query) {
    var res = {};

    query = query.trim().replace(/^(\?|#|&)/, "");

    if (!query) {
      return res;
    }

    query.split("&").forEach(function (param) {
      var parts = param.replace(/\+/g, " ").split("=");
      var key = decode(parts.shift());
      var val = parts.length > 0 ? decode(parts.join("=")) : null;

      if (res[key] === undefined) {
        res[key] = val;
      } else if (Array.isArray(res[key])) {
        res[key].push(val);
      } else {
        res[key] = [res[key], val];
      }
    });

    return res;
  }

  function stringifyQuery(obj) {
    var res = obj
      ? Object.keys(obj)
          .map(function (key) {
            var val = obj[key];

            if (val === undefined) {
              return "";
            }

            if (val === null) {
              return encode(key);
            }

            if (Array.isArray(val)) {
              var result = [];
              val.forEach(function (val2) {
                if (val2 === undefined) {
                  return;
                }
                if (val2 === null) {
                  result.push(encode(key));
                } else {
                  result.push(encode(key) + "=" + encode(val2));
                }
              });
              return result.join("&");
            }

            return encode(key) + "=" + encode(val);
          })
          .filter(function (x) {
            return x.length > 0;
          })
          .join("&")
      : null;
    return res ? "?" + res : "";
  }

  /*  */

  var trailingSlashRE = /\/?$/;

  function createRoute(record, location, redirectedFrom, router) {
    var stringifyQuery = router && router.options.stringifyQuery;

    var query = location.query || {};
    try {
      query = clone(query);
    } catch (e) {}

    var route = {
      name: location.name || (record && record.name),
      meta: (record && record.meta) || {},
      path: location.path || "/",
      hash: location.hash || "",
      query: query,
      params: location.params || {},
      fullPath: getFullPath(location, stringifyQuery),
      matched: record ? formatMatch(record) : [],
    };
    if (redirectedFrom) {
      route.redirectedFrom = getFullPath(redirectedFrom, stringifyQuery);
    }
    return Object.freeze(route);
  }

  function clone(value) {
    if (Array.isArray(value)) {
      return value.map(clone);
    } else if (value && typeof value === "object") {
      var res = {};
      for (var key in value) {
        res[key] = clone(value[key]);
      }
      return res;
    } else {
      return value;
    }
  }

  // the starting route that represents the initial state
  var START = createRoute(null, {
    path: "/",
  });

  function formatMatch(record) {
    var res = [];
    while (record) {
      res.unshift(record);
      record = record.parent;
    }
    return res;
  }

  function getFullPath(ref, _stringifyQuery) {
    var path = ref.path;
    var query = ref.query;
    if (query === void 0) query = {};
    var hash = ref.hash;
    if (hash === void 0) hash = "";

    var stringify = _stringifyQuery || stringifyQuery;
    return (path || "/") + stringify(query) + hash;
  }

  function isSameRoute(a, b, onlyPath) {
    if (b === START) {
      return a === b;
    } else if (!b) {
      return false;
    } else if (a.path && b.path) {
      return (
        a.path.replace(trailingSlashRE, "") ===
          b.path.replace(trailingSlashRE, "") &&
        (onlyPath || (a.hash === b.hash && isObjectEqual(a.query, b.query)))
      );
    } else if (a.name && b.name) {
      return (
        a.name === b.name &&
        (onlyPath ||
          (a.hash === b.hash &&
            isObjectEqual(a.query, b.query) &&
            isObjectEqual(a.params, b.params)))
      );
    } else {
      return false;
    }
  }

  function isObjectEqual(a, b) {
    if (a === void 0) a = {};
    if (b === void 0) b = {};

    // handle null value #1566
    if (!a || !b) {
      return a === b;
    }
    var aKeys = Object.keys(a).sort();
    var bKeys = Object.keys(b).sort();
    if (aKeys.length !== bKeys.length) {
      return false;
    }
    return aKeys.every(function (key, i) {
      var aVal = a[key];
      var bKey = bKeys[i];
      if (bKey !== key) {
        return false;
      }
      var bVal = b[key];
      // query values can be null and undefined
      if (aVal == null || bVal == null) {
        return aVal === bVal;
      }
      // check nested equality
      if (typeof aVal === "object" && typeof bVal === "object") {
        return isObjectEqual(aVal, bVal);
      }
      return String(aVal) === String(bVal);
    });
  }

  function isIncludedRoute(current, target) {
    return (
      current.path
        .replace(trailingSlashRE, "/")
        .indexOf(target.path.replace(trailingSlashRE, "/")) === 0 &&
      (!target.hash || current.hash === target.hash) &&
      queryIncludes(current.query, target.query)
    );
  }

  function queryIncludes(current, target) {
    for (var key in target) {
      if (!(key in current)) {
        return false;
      }
    }
    return true;
  }

  function handleRouteEntered(route) {
    for (var i = 0; i < route.matched.length; i++) {
      var record = route.matched[i];
      for (var name in record.instances) {
        var instance = record.instances[name];
        var cbs = record.enteredCbs[name];
        if (!instance || !cbs) {
          continue;
        }
        delete record.enteredCbs[name];
        for (var i$1 = 0; i$1 < cbs.length; i$1++) {
          if (!instance._isBeingDestroyed) {
            cbs[i$1](instance);
          }
        }
      }
    }
  }

  var View = {
    name: "RouterView",
    functional: true,
    props: {
      name: {
        type: String,
        default: "default",
      },
    },
    render: function render(_, ref) {
      var props = ref.props;
      var children = ref.children;
      var parent = ref.parent;
      var data = ref.data;

      // used by devtools to display a router-view badge
      data.routerView = true;

      // directly use parent context's createElement() function
      // so that components rendered by router-view can resolve named slots
      var h = parent.$createElement;
      var name = props.name;
      var route = parent.$route;
      var cache = parent._routerViewCache || (parent._routerViewCache = {});

      // determine current view depth, also check to see if the tree
      // has been toggled inactive but kept-alive.
      var depth = 0;
      var inactive = false;
      while (parent && parent._routerRoot !== parent) {
        var vnodeData = parent.$vnode ? parent.$vnode.data : {};
        if (vnodeData.routerView) {
          depth++;
        }
        if (vnodeData.keepAlive && parent._directInactive && parent._inactive) {
          inactive = true;
        }
        parent = parent.$parent;
      }
      data.routerViewDepth = depth;

      // render previous view if the tree is inactive and kept-alive
      if (inactive) {
        var cachedData = cache[name];
        var cachedComponent = cachedData && cachedData.component;
        if (cachedComponent) {
          // #2301
          // pass props
          if (cachedData.configProps) {
            fillPropsinData(
              cachedComponent,
              data,
              cachedData.route,
              cachedData.configProps
            );
          }
          return h(cachedComponent, data, children);
        } else {
          // render previous empty view
          return h();
        }
      }

      var matched = route.matched[depth];
      var component = matched && matched.components[name];

      // render empty node if no matched route or no config component
      if (!matched || !component) {
        cache[name] = null;
        return h();
      }

      // cache component
      cache[name] = { component: component };

      // attach instance registration hook
      // this will be called in the instance's injected lifecycle hooks
      data.registerRouteInstance = function (vm, val) {
        // val could be undefined for unregistration
        var current = matched.instances[name];
        if ((val && current !== vm) || (!val && current === vm)) {
          matched.instances[name] = val;
        }
      };

      // also register instance in prepatch hook
      // in case the same component instance is reused across different routes
      (data.hook || (data.hook = {})).prepatch = function (_, vnode) {
        matched.instances[name] = vnode.componentInstance;
      };

      // register instance in init hook
      // in case kept-alive component be actived when routes changed
      data.hook.init = function (vnode) {
        if (
          vnode.data.keepAlive &&
          vnode.componentInstance &&
          vnode.componentInstance !== matched.instances[name]
        ) {
          matched.instances[name] = vnode.componentInstance;
        }

        // if the route transition has already been confirmed then we weren't
        // able to call the cbs during confirmation as the component was not
        // registered yet, so we call it here.
        handleRouteEntered(route);
      };

      var configProps = matched.props && matched.props[name];
      // save route and configProps in cache
      if (configProps) {
        extend(cache[name], {
          route: route,
          configProps: configProps,
        });
        fillPropsinData(component, data, route, configProps);
      }

      return h(component, data, children);
    },
  };

  function fillPropsinData(component, data, route, configProps) {
    // resolve props
    var propsToPass = (data.props = resolveProps(route, configProps));
    if (propsToPass) {
      // clone to prevent mutation
      propsToPass = data.props = extend({}, propsToPass);
      // pass non-declared props as attrs
      var attrs = (data.attrs = data.attrs || {});
      for (var key in propsToPass) {
        if (!component.props || !(key in component.props)) {
          attrs[key] = propsToPass[key];
          delete propsToPass[key];
        }
      }
    }
  }

  function resolveProps(route, config) {
    switch (typeof config) {
      case "undefined":
        return;
      case "object":
        return config;
      case "function":
        return config(route);
      case "boolean":
        return config ? route.params : undefined;
      default: {
        warn(
          false,
          'props in "' +
            route.path +
            '" is a ' +
            typeof config +
            ", " +
            "expecting an object, function or boolean."
        );
      }
    }
  }

  /*  */

  function resolvePath(relative, base, append) {
    var firstChar = relative.charAt(0);
    if (firstChar === "/") {
      return relative;
    }

    if (firstChar === "?" || firstChar === "#") {
      return base + relative;
    }

    var stack = base.split("/");

    // remove trailing segment if:
    // - not appending
    // - appending to trailing slash (last segment is empty)
    if (!append || !stack[stack.length - 1]) {
      stack.pop();
    }

    // resolve relative path
    var segments = relative.replace(/^\//, "").split("/");
    for (var i = 0; i < segments.length; i++) {
      var segment = segments[i];
      if (segment === "..") {
        stack.pop();
      } else if (segment !== ".") {
        stack.push(segment);
      }
    }

    // ensure leading slash
    if (stack[0] !== "") {
      stack.unshift("");
    }

    return stack.join("/");
  }

  function parsePath(path) {
    var hash = "";
    var query = "";

    var hashIndex = path.indexOf("#");
    if (hashIndex >= 0) {
      hash = path.slice(hashIndex);
      path = path.slice(0, hashIndex);
    }

    var queryIndex = path.indexOf("?");
    if (queryIndex >= 0) {
      query = path.slice(queryIndex + 1);
      path = path.slice(0, queryIndex);
    }

    return {
      path: path,
      query: query,
      hash: hash,
    };
  }

  function cleanPath(path) {
    return path.replace(/\/+/g, "/");
  }

  var isarray =
    Array.isArray ||
    function (arr) {
      return Object.prototype.toString.call(arr) == "[object Array]";
    };

  /**
   * Expose `pathToRegexp`.
   */
  var pathToRegexp_1 = pathToRegexp;
  var parse_1 = parse;
  var compile_1 = compile;
  var tokensToFunction_1 = tokensToFunction;
  var tokensToRegExp_1 = tokensToRegExp;

  /**
   * The main path matching regexp utility.
   *
   * @type {RegExp}
   */
  var PATH_REGEXP = new RegExp(
    [
      // Match escaped characters that would otherwise appear in future matches.
      // This allows the user to escape special characters that won't transform.
      "(\\\\.)",
      // Match Express-style parameters and un-named parameters with a prefix
      // and optional suffixes. Matches appear as:
      //
      // "/:test(\\d+)?" => ["/", "test", "\d+", undefined, "?", undefined]
      // "/route(\\d+)"  => [undefined, undefined, undefined, "\d+", undefined, undefined]
      // "/*"            => ["/", undefined, undefined, undefined, undefined, "*"]
      "([\\/.])?(?:(?:\\:(\\w+)(?:\\(((?:\\\\.|[^\\\\()])+)\\))?|\\(((?:\\\\.|[^\\\\()])+)\\))([+*?])?|(\\*))",
    ].join("|"),
    "g"
  );

  /**
   * Parse a string for the raw tokens.
   *
   * @param  {string}  str
   * @param  {Object=} options
   * @return {!Array}
   */
  function parse(str, options) {
    var tokens = [];
    var key = 0;
    var index = 0;
    var path = "";
    var defaultDelimiter = (options && options.delimiter) || "/";
    var res;

    while ((res = PATH_REGEXP.exec(str)) != null) {
      var m = res[0];
      var escaped = res[1];
      var offset = res.index;
      path += str.slice(index, offset);
      index = offset + m.length;

      // Ignore already escaped sequences.
      if (escaped) {
        path += escaped[1];
        continue;
      }

      var next = str[index];
      var prefix = res[2];
      var name = res[3];
      var capture = res[4];
      var group = res[5];
      var modifier = res[6];
      var asterisk = res[7];

      // Push the current path onto the tokens.
      if (path) {
        tokens.push(path);
        path = "";
      }

      var partial = prefix != null && next != null && next !== prefix;
      var repeat = modifier === "+" || modifier === "*";
      var optional = modifier === "?" || modifier === "*";
      var delimiter = res[2] || defaultDelimiter;
      var pattern = capture || group;

      tokens.push({
        name: name || key++,
        prefix: prefix || "",
        delimiter: delimiter,
        optional: optional,
        repeat: repeat,
        partial: partial,
        asterisk: !!asterisk,
        pattern: pattern
          ? escapeGroup(pattern)
          : asterisk
          ? ".*"
          : "[^" + escapeString(delimiter) + "]+?",
      });
    }

    // Match any characters still remaining.
    if (index < str.length) {
      path += str.substr(index);
    }

    // If the path exists, push it onto the end.
    if (path) {
      tokens.push(path);
    }

    return tokens;
  }

  /**
   * Compile a string to a template function for the path.
   *
   * @param  {string}             str
   * @param  {Object=}            options
   * @return {!function(Object=, Object=)}
   */
  function compile(str, options) {
    return tokensToFunction(parse(str, options), options);
  }

  /**
   * Prettier encoding of URI path segments.
   *
   * @param  {string}
   * @return {string}
   */
  function encodeURIComponentPretty(str) {
    return encodeURI(str).replace(/[\/?#]/g, function (c) {
      return "%" + c.charCodeAt(0).toString(16).toUpperCase();
    });
  }

  /**
   * Encode the asterisk parameter. Similar to `pretty`, but allows slashes.
   *
   * @param  {string}
   * @return {string}
   */
  function encodeAsterisk(str) {
    return encodeURI(str).replace(/[?#]/g, function (c) {
      return "%" + c.charCodeAt(0).toString(16).toUpperCase();
    });
  }

  /**
   * Expose a method for transforming tokens into the path function.
   */
  function tokensToFunction(tokens, options) {
    // Compile all the tokens into regexps.
    var matches = new Array(tokens.length);

    // Compile all the patterns before compilation.
    for (var i = 0; i < tokens.length; i++) {
      if (typeof tokens[i] === "object") {
        matches[i] = new RegExp(
          "^(?:" + tokens[i].pattern + ")$",
          flags(options)
        );
      }
    }

    return function (obj, opts) {
      var path = "";
      var data = obj || {};
      var options = opts || {};
      var encode = options.pretty
        ? encodeURIComponentPretty
        : encodeURIComponent;

      for (var i = 0; i < tokens.length; i++) {
        var token = tokens[i];

        if (typeof token === "string") {
          path += token;

          continue;
        }

        var value = data[token.name];
        var segment;

        if (value == null) {
          if (token.optional) {
            // Prepend partial segment prefixes.
            if (token.partial) {
              path += token.prefix;
            }

            continue;
          } else {
            throw new TypeError('Expected "' + token.name + '" to be defined');
          }
        }

        if (isarray(value)) {
          if (!token.repeat) {
            throw new TypeError(
              'Expected "' +
                token.name +
                '" to not repeat, but received `' +
                JSON.stringify(value) +
                "`"
            );
          }

          if (value.length === 0) {
            if (token.optional) {
              continue;
            } else {
              throw new TypeError(
                'Expected "' + token.name + '" to not be empty'
              );
            }
          }

          for (var j = 0; j < value.length; j++) {
            segment = encode(value[j]);

            if (!matches[i].test(segment)) {
              throw new TypeError(
                'Expected all "' +
                  token.name +
                  '" to match "' +
                  token.pattern +
                  '", but received `' +
                  JSON.stringify(segment) +
                  "`"
              );
            }

            path += (j === 0 ? token.prefix : token.delimiter) + segment;
          }

          continue;
        }

        segment = token.asterisk ? encodeAsterisk(value) : encode(value);

        if (!matches[i].test(segment)) {
          throw new TypeError(
            'Expected "' +
              token.name +
              '" to match "' +
              token.pattern +
              '", but received "' +
              segment +
              '"'
          );
        }

        path += token.prefix + segment;
      }

      return path;
    };
  }

  /**
   * Escape a regular expression string.
   *
   * @param  {string} str
   * @return {string}
   */
  function escapeString(str) {
    return str.replace(/([.+*?=^!:${}()[\]|\/\\])/g, "\\$1");
  }

  /**
   * Escape the capturing group by escaping special characters and meaning.
   *
   * @param  {string} group
   * @return {string}
   */
  function escapeGroup(group) {
    return group.replace(/([=!:$\/()])/g, "\\$1");
  }

  /**
   * Attach the keys as a property of the regexp.
   *
   * @param  {!RegExp} re
   * @param  {Array}   keys
   * @return {!RegExp}
   */
  function attachKeys(re, keys) {
    re.keys = keys;
    return re;
  }

  /**
   * Get the flags for a regexp from the options.
   *
   * @param  {Object} options
   * @return {string}
   */
  function flags(options) {
    return options && options.sensitive ? "" : "i";
  }

  /**
   * Pull out keys from a regexp.
   *
   * @param  {!RegExp} path
   * @param  {!Array}  keys
   * @return {!RegExp}
   */
  function regexpToRegexp(path, keys) {
    // Use a negative lookahead to match only capturing groups.
    var groups = path.source.match(/\((?!\?)/g);

    if (groups) {
      for (var i = 0; i < groups.length; i++) {
        keys.push({
          name: i,
          prefix: null,
          delimiter: null,
          optional: false,
          repeat: false,
          partial: false,
          asterisk: false,
          pattern: null,
        });
      }
    }

    return attachKeys(path, keys);
  }

  /**
   * Transform an array into a regexp.
   *
   * @param  {!Array}  path
   * @param  {Array}   keys
   * @param  {!Object} options
   * @return {!RegExp}
   */
  function arrayToRegexp(path, keys, options) {
    var parts = [];

    for (var i = 0; i < path.length; i++) {
      parts.push(pathToRegexp(path[i], keys, options).source);
    }

    var regexp = new RegExp("(?:" + parts.join("|") + ")", flags(options));

    return attachKeys(regexp, keys);
  }

  /**
   * Create a path regexp from string input.
   *
   * @param  {string}  path
   * @param  {!Array}  keys
   * @param  {!Object} options
   * @return {!RegExp}
   */
  function stringToRegexp(path, keys, options) {
    return tokensToRegExp(parse(path, options), keys, options);
  }

  /**
   * Expose a function for taking tokens and returning a RegExp.
   *
   * @param  {!Array}          tokens
   * @param  {(Array|Object)=} keys
   * @param  {Object=}         options
   * @return {!RegExp}
   */
  function tokensToRegExp(tokens, keys, options) {
    if (!isarray(keys)) {
      options = /** @type {!Object} */ (keys || options);
      keys = [];
    }

    options = options || {};

    var strict = options.strict;
    var end = options.end !== false;
    var route = "";

    // Iterate over the tokens and create our regexp string.
    for (var i = 0; i < tokens.length; i++) {
      var token = tokens[i];

      if (typeof token === "string") {
        route += escapeString(token);
      } else {
        var prefix = escapeString(token.prefix);
        var capture = "(?:" + token.pattern + ")";

        keys.push(token);

        if (token.repeat) {
          capture += "(?:" + prefix + capture + ")*";
        }

        if (token.optional) {
          if (!token.partial) {
            capture = "(?:" + prefix + "(" + capture + "))?";
          } else {
            capture = prefix + "(" + capture + ")?";
          }
        } else {
          capture = prefix + "(" + capture + ")";
        }

        route += capture;
      }
    }

    var delimiter = escapeString(options.delimiter || "/");
    var endsWithDelimiter = route.slice(-delimiter.length) === delimiter;

    // In non-strict mode we allow a slash at the end of match. If the path to
    // match already ends with a slash, we remove it for consistency. The slash
    // is valid at the end of a path match, not in the middle. This is important
    // in non-ending mode, where "/test/" shouldn't match "/test//route".
    if (!strict) {
      route =
        (endsWithDelimiter ? route.slice(0, -delimiter.length) : route) +
        "(?:" +
        delimiter +
        "(?=$))?";
    }

    if (end) {
      route += "$";
    } else {
      // In non-ending mode, we need the capturing groups to match as much as
      // possible by using a positive lookahead to the end or next path segment.
      route += strict && endsWithDelimiter ? "" : "(?=" + delimiter + "|$)";
    }

    return attachKeys(new RegExp("^" + route, flags(options)), keys);
  }

  /**
   * Normalize the given path string, returning a regular expression.
   *
   * An empty array can be passed in for the keys, which will hold the
   * placeholder key descriptions. For example, using `/user/:id`, `keys` will
   * contain `[{ name: 'id', delimiter: '/', optional: false, repeat: false }]`.
   *
   * @param  {(string|RegExp|Array)} path
   * @param  {(Array|Object)=}       keys
   * @param  {Object=}               options
   * @return {!RegExp}
   */
  function pathToRegexp(path, keys, options) {
    if (!isarray(keys)) {
      options = /** @type {!Object} */ (keys || options);
      keys = [];
    }

    options = options || {};

    if (path instanceof RegExp) {
      return regexpToRegexp(path, /** @type {!Array} */ (keys));
    }

    if (isarray(path)) {
      return arrayToRegexp(
        /** @type {!Array} */ (path),
        /** @type {!Array} */ (keys),
        options
      );
    }

    return stringToRegexp(
      /** @type {string} */ (path),
      /** @type {!Array} */ (keys),
      options
    );
  }
  pathToRegexp_1.parse = parse_1;
  pathToRegexp_1.compile = compile_1;
  pathToRegexp_1.tokensToFunction = tokensToFunction_1;
  pathToRegexp_1.tokensToRegExp = tokensToRegExp_1;

  /*  */

  // $flow-disable-line
  var regexpCompileCache = Object.create(null);

  function fillParams(path, params, routeMsg) {
    params = params || {};
    try {
      var filler =
        regexpCompileCache[path] ||
        (regexpCompileCache[path] = pathToRegexp_1.compile(path));

      // Fix #2505 resolving asterisk routes { name: 'not-found', params: { pathMatch: '/not-found' }}
      // and fix #3106 so that you can work with location descriptor object having params.pathMatch equal to empty string
      if (typeof params.pathMatch === "string") {
        params[0] = params.pathMatch;
      }

      return filler(params, { pretty: true });
    } catch (e) {
      {
        // Fix #3072 no warn if `pathMatch` is string
        warn(
          typeof params.pathMatch === "string",
          "missing param for " + routeMsg + ": " + e.message
        );
      }
      return "";
    } finally {
      // delete the 0 if it was added
      delete params[0];
    }
  }

  /*  */

  function normalizeLocation(raw, current, append, router) {
    var next = typeof raw === "string" ? { path: raw } : raw;
    // named target
    if (next._normalized) {
      return next;
    } else if (next.name) {
      next = extend({}, raw);
      var params = next.params;
      if (params && typeof params === "object") {
        next.params = extend({}, params);
      }
      return next;
    }

    // relative params
    if (!next.path && next.params && current) {
      next = extend({}, next);
      next._normalized = true;
      var params$1 = extend(extend({}, current.params), next.params);
      if (current.name) {
        next.name = current.name;
        next.params = params$1;
      } else if (current.matched.length) {
        var rawPath = current.matched[current.matched.length - 1].path;
        next.path = fillParams(rawPath, params$1, "path " + current.path);
      } else {
        warn(false, "relative params navigation requires a current route.");
      }
      return next;
    }

    var parsedPath = parsePath(next.path || "");
    var basePath = (current && current.path) || "/";
    var path = parsedPath.path
      ? resolvePath(parsedPath.path, basePath, append || next.append)
      : basePath;

    var query = resolveQuery(
      parsedPath.query,
      next.query,
      router && router.options.parseQuery
    );

    var hash = next.hash || parsedPath.hash;
    if (hash && hash.charAt(0) !== "#") {
      hash = "#" + hash;
    }

    return {
      _normalized: true,
      path: path,
      query: query,
      hash: hash,
    };
  }

  /*  */

  // work around weird flow bug
  var toTypes = [String, Object];
  var eventTypes = [String, Array];

  var noop = function () {};

  var warnedCustomSlot;
  var warnedTagProp;
  var warnedEventProp;

  var Link = {
    name: "RouterLink",
    props: {
      to: {
        type: toTypes,
        required: true,
      },
      tag: {
        type: String,
        default: "a",
      },
      custom: Boolean,
      exact: Boolean,
      exactPath: Boolean,
      append: Boolean,
      replace: Boolean,
      activeClass: String,
      exactActiveClass: String,
      ariaCurrentValue: {
        type: String,
        default: "page",
      },
      event: {
        type: eventTypes,
        default: "click",
      },
    },
    render: function render(h) {
      var this$1 = this;

      var router = this.$router;
      var current = this.$route;
      var ref = router.resolve(this.to, current, this.append);
      var location = ref.location;
      var route = ref.route;
      var href = ref.href;

      var classes = {};
      var globalActiveClass = router.options.linkActiveClass;
      var globalExactActiveClass = router.options.linkExactActiveClass;
      // Support global empty active class
      var activeClassFallback =
        globalActiveClass == null ? "router-link-active" : globalActiveClass;
      var exactActiveClassFallback =
        globalExactActiveClass == null
          ? "router-link-exact-active"
          : globalExactActiveClass;
      var activeClass =
        this.activeClass == null ? activeClassFallback : this.activeClass;
      var exactActiveClass =
        this.exactActiveClass == null
          ? exactActiveClassFallback
          : this.exactActiveClass;

      var compareTarget = route.redirectedFrom
        ? createRoute(
            null,
            normalizeLocation(route.redirectedFrom),
            null,
            router
          )
        : route;

      classes[exactActiveClass] = isSameRoute(
        current,
        compareTarget,
        this.exactPath
      );
      classes[activeClass] =
        this.exact || this.exactPath
          ? classes[exactActiveClass]
          : isIncludedRoute(current, compareTarget);

      var ariaCurrentValue = classes[exactActiveClass]
        ? this.ariaCurrentValue
        : null;

      var handler = function (e) {
        if (guardEvent(e)) {
          if (this$1.replace) {
            router.replace(location, noop);
          } else {
            router.push(location, noop);
          }
        }
      };

      var on = { click: guardEvent };
      if (Array.isArray(this.event)) {
        this.event.forEach(function (e) {
          on[e] = handler;
        });
      } else {
        on[this.event] = handler;
      }

      var data = { class: classes };

      var scopedSlot =
        !this.$scopedSlots.$hasNormal &&
        this.$scopedSlots.default &&
        this.$scopedSlots.default({
          href: href,
          route: route,
          navigate: handler,
          isActive: classes[activeClass],
          isExactActive: classes[exactActiveClass],
        });

      if (scopedSlot) {
        if (!this.custom) {
          !warnedCustomSlot &&
            warn(
              false,
              'In Vue Router 4, the v-slot API will by default wrap its content with an <a> element. Use the custom prop to remove this warning:\n<router-link v-slot="{ navigate, href }" custom></router-link>\n'
            );
          warnedCustomSlot = true;
        }
        if (scopedSlot.length === 1) {
          return scopedSlot[0];
        } else if (scopedSlot.length > 1 || !scopedSlot.length) {
          {
            warn(
              false,
              '<router-link> with to="' +
                this.to +
                "\" is trying to use a scoped slot but it didn't provide exactly one child. Wrapping the content with a span element."
            );
          }
          return scopedSlot.length === 0 ? h() : h("span", {}, scopedSlot);
        }
      }

      {
        if ("tag" in this.$options.propsData && !warnedTagProp) {
          warn(
            false,
            "<router-link>'s tag prop is deprecated and has been removed in Vue Router 4. Use the v-slot API to remove this warning: https://next.router.vuejs.org/guide/migration/#removal-of-event-and-tag-props-in-router-link."
          );
          warnedTagProp = true;
        }
        if ("event" in this.$options.propsData && !warnedEventProp) {
          warn(
            false,
            "<router-link>'s event prop is deprecated and has been removed in Vue Router 4. Use the v-slot API to remove this warning: https://next.router.vuejs.org/guide/migration/#removal-of-event-and-tag-props-in-router-link."
          );
          warnedEventProp = true;
        }
      }

      if (this.tag === "a") {
        data.on = on;
        data.attrs = { href: href, "aria-current": ariaCurrentValue };
      } else {
        // find the first <a> child and apply listener and href
        var a = findAnchor(this.$slots.default);
        if (a) {
          // in case the <a> is a static node
          a.isStatic = false;
          var aData = (a.data = extend({}, a.data));
          aData.on = aData.on || {};
          // transform existing events in both objects into arrays so we can push later
          for (var event in aData.on) {
            var handler$1 = aData.on[event];
            if (event in on) {
              aData.on[event] = Array.isArray(handler$1)
                ? handler$1
                : [handler$1];
            }
          }
          // append new listeners for router-link
          for (var event$1 in on) {
            if (event$1 in aData.on) {
              // on[event] is always a function
              aData.on[event$1].push(on[event$1]);
            } else {
              aData.on[event$1] = handler;
            }
          }

          var aAttrs = (a.data.attrs = extend({}, a.data.attrs));
          aAttrs.href = href;
          aAttrs["aria-current"] = ariaCurrentValue;
        } else {
          // doesn't have <a> child, apply listener to self
          data.on = on;
        }
      }

      return h(this.tag, data, this.$slots.default);
    },
  };

  function guardEvent(e) {
    // don't redirect with control keys
    if (e.metaKey || e.altKey || e.ctrlKey || e.shiftKey) {
      return;
    }
    // don't redirect when preventDefault called
    if (e.defaultPrevented) {
      return;
    }
    // don't redirect on right click
    if (e.button !== undefined && e.button !== 0) {
      return;
    }
    // don't redirect if `target="_blank"`
    if (e.currentTarget && e.currentTarget.getAttribute) {
      var target = e.currentTarget.getAttribute("target");
      if (/\b_blank\b/i.test(target)) {
        return;
      }
    }
    // this may be a Weex event which doesn't have this method
    if (e.preventDefault) {
      e.preventDefault();
    }
    return true;
  }

  function findAnchor(children) {
    if (children) {
      var child;
      for (var i = 0; i < children.length; i++) {
        child = children[i];
        if (child.tag === "a") {
          return child;
        }
        if (child.children && (child = findAnchor(child.children))) {
          return child;
        }
      }
    }
  }

  var _Vue;

  function install(Vue) {
    if (install.installed && _Vue === Vue) {
      return;
    }
    install.installed = true;

    _Vue = Vue;

    var isDef = function (v) {
      return v !== undefined;
    };

    var registerInstance = function (vm, callVal) {
      var i = vm.$options._parentVnode;
      if (
        isDef(i) &&
        isDef((i = i.data)) &&
        isDef((i = i.registerRouteInstance))
      ) {
        i(vm, callVal);
      }
    };

    Vue.mixin({
      beforeCreate: function beforeCreate() {
        if (isDef(this.$options.router)) {
          this._routerRoot = this;
          this._router = this.$options.router;
          this._router.init(this);
          Vue.util.defineReactive(this, "_route", this._router.history.current);
        } else {
          this._routerRoot = (this.$parent && this.$parent._routerRoot) || this;
        }
        registerInstance(this, this);
      },
      destroyed: function destroyed() {
        registerInstance(this);
      },
    });

    Object.defineProperty(Vue.prototype, "$router", {
      get: function get() {
        return this._routerRoot._router;
      },
    });

    Object.defineProperty(Vue.prototype, "$route", {
      get: function get() {
        return this._routerRoot._route;
      },
    });

    Vue.component("RouterView", View);
    Vue.component("RouterLink", Link);

    var strats = Vue.config.optionMergeStrategies;
    // use the same hook merging strategy for route hooks
    strats.beforeRouteEnter =
      strats.beforeRouteLeave =
      strats.beforeRouteUpdate =
        strats.created;
  }

  /*  */

  var inBrowser = typeof window !== "undefined";

  /*  */

  function createRouteMap(
    routes,
    oldPathList,
    oldPathMap,
    oldNameMap,
    parentRoute
  ) {
    // the path list is used to control path matching priority
    var pathList = oldPathList || [];
    // $flow-disable-line
    var pathMap = oldPathMap || Object.create(null);
    // $flow-disable-line
    var nameMap = oldNameMap || Object.create(null);

    routes.forEach(function (route) {
      addRouteRecord(pathList, pathMap, nameMap, route, parentRoute);
    });

    // ensure wildcard routes are always at the end
    for (var i = 0, l = pathList.length; i < l; i++) {
      if (pathList[i] === "*") {
        pathList.push(pathList.splice(i, 1)[0]);
        l--;
        i--;
      }
    }

    {
      // warn if routes do not include leading slashes
      var found = pathList
        // check for missing leading slash
        .filter(function (path) {
          return path && path.charAt(0) !== "*" && path.charAt(0) !== "/";
        });

      if (found.length > 0) {
        var pathNames = found
          .map(function (path) {
            return "- " + path;
          })
          .join("\n");
        warn(
          false,
          "Non-nested routes must include a leading slash character. Fix the following routes: \n" +
            pathNames
        );
      }
    }

    return {
      pathList: pathList,
      pathMap: pathMap,
      nameMap: nameMap,
    };
  }

  function addRouteRecord(pathList, pathMap, nameMap, route, parent, matchAs) {
    var path = route.path;
    var name = route.name;
    {
      assert(path != null, '"path" is required in a route configuration.');
      assert(
        typeof route.component !== "string",
        'route config "component" for path: ' +
          String(path || name) +
          " cannot be a " +
          "string id. Use an actual component instead."
      );

      warn(
        // eslint-disable-next-line no-control-regex
        !/[^\u0000-\u007F]+/.test(path),
        'Route with path "' +
          path +
          '" contains unencoded characters, make sure ' +
          "your path is correctly encoded before passing it to the router. Use " +
          "encodeURI to encode static segments of your path."
      );
    }

    var pathToRegexpOptions = route.pathToRegexpOptions || {};
    var normalizedPath = normalizePath(
      path,
      parent,
      pathToRegexpOptions.strict
    );

    if (typeof route.caseSensitive === "boolean") {
      pathToRegexpOptions.sensitive = route.caseSensitive;
    }

    var record = {
      path: normalizedPath,
      regex: compileRouteRegex(normalizedPath, pathToRegexpOptions),
      components: route.components || { default: route.component },
      alias: route.alias
        ? typeof route.alias === "string"
          ? [route.alias]
          : route.alias
        : [],
      instances: {},
      enteredCbs: {},
      name: name,
      parent: parent,
      matchAs: matchAs,
      redirect: route.redirect,
      beforeEnter: route.beforeEnter,
      meta: route.meta || {},
      props:
        route.props == null
          ? {}
          : route.components
          ? route.props
          : { default: route.props },
    };

    if (route.children) {
      // Warn if route is named, does not redirect and has a default child route.
      // If users navigate to this route by name, the default child will
      // not be rendered (GH Issue #629)
      {
        if (
          route.name &&
          !route.redirect &&
          route.children.some(function (child) {
            return /^\/?$/.test(child.path);
          })
        ) {
          warn(
            false,
            "Named Route '" +
              route.name +
              "' has a default child route. " +
              "When navigating to this named route (:to=\"{name: '" +
              route.name +
              "'\"), " +
              "the default child route will not be rendered. Remove the name from " +
              "this route and use the name of the default child route for named " +
              "links instead."
          );
        }
      }
      route.children.forEach(function (child) {
        var childMatchAs = matchAs
          ? cleanPath(matchAs + "/" + child.path)
          : undefined;
        addRouteRecord(pathList, pathMap, nameMap, child, record, childMatchAs);
      });
    }

    if (!pathMap[record.path]) {
      pathList.push(record.path);
      pathMap[record.path] = record;
    }

    if (route.alias !== undefined) {
      var aliases = Array.isArray(route.alias) ? route.alias : [route.alias];
      for (var i = 0; i < aliases.length; ++i) {
        var alias = aliases[i];
        if (alias === path) {
          warn(
            false,
            'Found an alias with the same value as the path: "' +
              path +
              '". You have to remove that alias. It will be ignored in development.'
          );
          // skip in dev to make it work
          continue;
        }

        var aliasRoute = {
          path: alias,
          children: route.children,
        };
        addRouteRecord(
          pathList,
          pathMap,
          nameMap,
          aliasRoute,
          parent,
          record.path || "/" // matchAs
        );
      }
    }

    if (name) {
      if (!nameMap[name]) {
        nameMap[name] = record;
      } else if (!matchAs) {
        warn(
          false,
          "Duplicate named routes definition: " +
            '{ name: "' +
            name +
            '", path: "' +
            record.path +
            '" }'
        );
      }
    }
  }

  function compileRouteRegex(path, pathToRegexpOptions) {
    var regex = pathToRegexp_1(path, [], pathToRegexpOptions);
    {
      var keys = Object.create(null);
      regex.keys.forEach(function (key) {
        warn(
          !keys[key.name],
          'Duplicate param keys in route with path: "' + path + '"'
        );
        keys[key.name] = true;
      });
    }
    return regex;
  }

  function normalizePath(path, parent, strict) {
    if (!strict) {
      path = path.replace(/\/$/, "");
    }
    if (path[0] === "/") {
      return path;
    }
    if (parent == null) {
      return path;
    }
    return cleanPath(parent.path + "/" + path);
  }

  /*  */

  function createMatcher(routes, router) {
    var ref = createRouteMap(routes);
    var pathList = ref.pathList;
    var pathMap = ref.pathMap;
    var nameMap = ref.nameMap;

    function addRoutes(routes) {
      createRouteMap(routes, pathList, pathMap, nameMap);
    }

    function addRoute(parentOrRoute, route) {
      var parent =
        typeof parentOrRoute !== "object" ? nameMap[parentOrRoute] : undefined;
      // $flow-disable-line
      createRouteMap(
        [route || parentOrRoute],
        pathList,
        pathMap,
        nameMap,
        parent
      );

      // add aliases of parent
      if (parent && parent.alias.length) {
        createRouteMap(
          // $flow-disable-line route is defined if parent is
          parent.alias.map(function (alias) {
            return { path: alias, children: [route] };
          }),
          pathList,
          pathMap,
          nameMap,
          parent
        );
      }
    }

    function getRoutes() {
      return pathList.map(function (path) {
        return pathMap[path];
      });
    }

    function match(raw, currentRoute, redirectedFrom) {
      var location = normalizeLocation(raw, currentRoute, false, router);
      var name = location.name;

      if (name) {
        var record = nameMap[name];
        {
          warn(record, "Route with name '" + name + "' does not exist");
        }
        if (!record) {
          return _createRoute(null, location);
        }
        var paramNames = record.regex.keys
          .filter(function (key) {
            return !key.optional;
          })
          .map(function (key) {
            return key.name;
          });

        if (typeof location.params !== "object") {
          location.params = {};
        }

        if (currentRoute && typeof currentRoute.params === "object") {
          for (var key in currentRoute.params) {
            if (!(key in location.params) && paramNames.indexOf(key) > -1) {
              location.params[key] = currentRoute.params[key];
            }
          }
        }

        location.path = fillParams(
          record.path,
          location.params,
          'named route "' + name + '"'
        );
        return _createRoute(record, location, redirectedFrom);
      } else if (location.path) {
        location.params = {};
        for (var i = 0; i < pathList.length; i++) {
          var path = pathList[i];
          var record$1 = pathMap[path];
          if (matchRoute(record$1.regex, location.path, location.params)) {
            return _createRoute(record$1, location, redirectedFrom);
          }
        }
      }
      // no match
      return _createRoute(null, location);
    }

    function redirect(record, location) {
      var originalRedirect = record.redirect;
      var redirect =
        typeof originalRedirect === "function"
          ? originalRedirect(createRoute(record, location, null, router))
          : originalRedirect;

      if (typeof redirect === "string") {
        redirect = { path: redirect };
      }

      if (!redirect || typeof redirect !== "object") {
        {
          warn(false, "invalid redirect option: " + JSON.stringify(redirect));
        }
        return _createRoute(null, location);
      }

      var re = redirect;
      var name = re.name;
      var path = re.path;
      var query = location.query;
      var hash = location.hash;
      var params = location.params;
      query = re.hasOwnProperty("query") ? re.query : query;
      hash = re.hasOwnProperty("hash") ? re.hash : hash;
      params = re.hasOwnProperty("params") ? re.params : params;

      if (name) {
        // resolved named direct
        var targetRecord = nameMap[name];
        {
          assert(
            targetRecord,
            'redirect failed: named route "' + name + '" not found.'
          );
        }
        return match(
          {
            _normalized: true,
            name: name,
            query: query,
            hash: hash,
            params: params,
          },
          undefined,
          location
        );
      } else if (path) {
        // 1. resolve relative redirect
        var rawPath = resolveRecordPath(path, record);
        // 2. resolve params
        var resolvedPath = fillParams(
          rawPath,
          params,
          'redirect route with path "' + rawPath + '"'
        );
        // 3. rematch with existing query and hash
        return match(
          {
            _normalized: true,
            path: resolvedPath,
            query: query,
            hash: hash,
          },
          undefined,
          location
        );
      } else {
        {
          warn(false, "invalid redirect option: " + JSON.stringify(redirect));
        }
        return _createRoute(null, location);
      }
    }

    function alias(record, location, matchAs) {
      var aliasedPath = fillParams(
        matchAs,
        location.params,
        'aliased route with path "' + matchAs + '"'
      );
      var aliasedMatch = match({
        _normalized: true,
        path: aliasedPath,
      });
      if (aliasedMatch) {
        var matched = aliasedMatch.matched;
        var aliasedRecord = matched[matched.length - 1];
        location.params = aliasedMatch.params;
        return _createRoute(aliasedRecord, location);
      }
      return _createRoute(null, location);
    }

    function _createRoute(record, location, redirectedFrom) {
      if (record && record.redirect) {
        return redirect(record, redirectedFrom || location);
      }
      if (record && record.matchAs) {
        return alias(record, location, record.matchAs);
      }
      return createRoute(record, location, redirectedFrom, router);
    }

    return {
      match: match,
      addRoute: addRoute,
      getRoutes: getRoutes,
      addRoutes: addRoutes,
    };
  }

  function matchRoute(regex, path, params) {
    var m = path.match(regex);

    if (!m) {
      return false;
    } else if (!params) {
      return true;
    }

    for (var i = 1, len = m.length; i < len; ++i) {
      var key = regex.keys[i - 1];
      if (key) {
        // Fix #1994: using * with props: true generates a param named 0
        params[key.name || "pathMatch"] =
          typeof m[i] === "string" ? decode(m[i]) : m[i];
      }
    }

    return true;
  }

  function resolveRecordPath(path, record) {
    return resolvePath(path, record.parent ? record.parent.path : "/", true);
  }

  /*  */

  // use User Timing api (if present) for more accurate key precision
  var Time =
    inBrowser && window.performance && window.performance.now
      ? window.performance
      : Date;

  function genStateKey() {
    return Time.now().toFixed(3);
  }

  var _key = genStateKey();

  function getStateKey() {
    return _key;
  }

  function setStateKey(key) {
    return (_key = key);
  }

  /*  */

  var positionStore = Object.create(null);

  function setupScroll() {
    // Prevent browser scroll behavior on History popstate
    if ("scrollRestoration" in window.history) {
      window.history.scrollRestoration = "manual";
    }
    // Fix for #1585 for Firefox
    // Fix for #2195 Add optional third attribute to workaround a bug in safari https://bugs.webkit.org/show_bug.cgi?id=182678
    // Fix for #2774 Support for apps loaded from Windows file shares not mapped to network drives: replaced location.origin with
    // window.location.protocol + '//' + window.location.host
    // location.host contains the port and location.hostname doesn't
    var protocolAndPath =
      window.location.protocol + "//" + window.location.host;
    var absolutePath = window.location.href.replace(protocolAndPath, "");
    // preserve existing history state as it could be overriden by the user
    var stateCopy = extend({}, window.history.state);
    stateCopy.key = getStateKey();
    window.history.replaceState(stateCopy, "", absolutePath);
    window.addEventListener("popstate", handlePopState);
    return function () {
      window.removeEventListener("popstate", handlePopState);
    };
  }

  function handleScroll(router, to, from, isPop) {
    if (!router.app) {
      return;
    }

    var behavior = router.options.scrollBehavior;
    if (!behavior) {
      return;
    }

    {
      assert(
        typeof behavior === "function",
        "scrollBehavior must be a function"
      );
    }

    // wait until re-render finishes before scrolling
    router.app.$nextTick(function () {
      var position = getScrollPosition();
      var shouldScroll = behavior.call(
        router,
        to,
        from,
        isPop ? position : null
      );

      if (!shouldScroll) {
        return;
      }

      if (typeof shouldScroll.then === "function") {
        shouldScroll
          .then(function (shouldScroll) {
            scrollToPosition(shouldScroll, position);
          })
          .catch(function (err) {
            {
              assert(false, err.toString());
            }
          });
      } else {
        scrollToPosition(shouldScroll, position);
      }
    });
  }

  function saveScrollPosition() {
    var key = getStateKey();
    if (key) {
      positionStore[key] = {
        x: window.pageXOffset,
        y: window.pageYOffset,
      };
    }
  }

  function handlePopState(e) {
    saveScrollPosition();
    if (e.state && e.state.key) {
      setStateKey(e.state.key);
    }
  }

  function getScrollPosition() {
    var key = getStateKey();
    if (key) {
      return positionStore[key];
    }
  }

  function getElementPosition(el, offset) {
    var docEl = document.documentElement;
    var docRect = docEl.getBoundingClientRect();
    var elRect = el.getBoundingClientRect();
    return {
      x: elRect.left - docRect.left - offset.x,
      y: elRect.top - docRect.top - offset.y,
    };
  }

  function isValidPosition(obj) {
    return isNumber(obj.x) || isNumber(obj.y);
  }

  function normalizePosition(obj) {
    return {
      x: isNumber(obj.x) ? obj.x : window.pageXOffset,
      y: isNumber(obj.y) ? obj.y : window.pageYOffset,
    };
  }

  function normalizeOffset(obj) {
    return {
      x: isNumber(obj.x) ? obj.x : 0,
      y: isNumber(obj.y) ? obj.y : 0,
    };
  }

  function isNumber(v) {
    return typeof v === "number";
  }

  var hashStartsWithNumberRE = /^#\d/;

  function scrollToPosition(shouldScroll, position) {
    var isObject = typeof shouldScroll === "object";
    if (isObject && typeof shouldScroll.selector === "string") {
      // getElementById would still fail if the selector contains a more complicated query like #main[data-attr]
      // but at the same time, it doesn't make much sense to select an element with an id and an extra selector
      var el = hashStartsWithNumberRE.test(shouldScroll.selector) // $flow-disable-line
        ? document.getElementById(shouldScroll.selector.slice(1)) // $flow-disable-line
        : document.querySelector(shouldScroll.selector);

      if (el) {
        var offset =
          shouldScroll.offset && typeof shouldScroll.offset === "object"
            ? shouldScroll.offset
            : {};
        offset = normalizeOffset(offset);
        position = getElementPosition(el, offset);
      } else if (isValidPosition(shouldScroll)) {
        position = normalizePosition(shouldScroll);
      }
    } else if (isObject && isValidPosition(shouldScroll)) {
      position = normalizePosition(shouldScroll);
    }

    if (position) {
      // $flow-disable-line
      if ("scrollBehavior" in document.documentElement.style) {
        window.scrollTo({
          left: position.x,
          top: position.y,
          // $flow-disable-line
          behavior: shouldScroll.behavior,
        });
      } else {
        window.scrollTo(position.x, position.y);
      }
    }
  }

  /*  */

  var supportsPushState =
    inBrowser &&
    (function () {
      var ua = window.navigator.userAgent;

      if (
        (ua.indexOf("Android 2.") !== -1 || ua.indexOf("Android 4.0") !== -1) &&
        ua.indexOf("Mobile Safari") !== -1 &&
        ua.indexOf("Chrome") === -1 &&
        ua.indexOf("Windows Phone") === -1
      ) {
        return false;
      }

      return window.history && typeof window.history.pushState === "function";
    })();

  function pushState(url, replace) {
    saveScrollPosition();
    // try...catch the pushState call to get around Safari
    // DOM Exception 18 where it limits to 100 pushState calls
    var history = window.history;
    try {
      if (replace) {
        // preserve existing history state as it could be overriden by the user
        var stateCopy = extend({}, history.state);
        stateCopy.key = getStateKey();
        history.replaceState(stateCopy, "", url);
      } else {
        history.pushState({ key: setStateKey(genStateKey()) }, "", url);
      }
    } catch (e) {
      window.location[replace ? "replace" : "assign"](url);
    }
  }

  function replaceState(url) {
    pushState(url, true);
  }

  /*  */

  function runQueue(queue, fn, cb) {
    var step = function (index) {
      if (index >= queue.length) {
        cb();
      } else {
        if (queue[index]) {
          fn(queue[index], function () {
            step(index + 1);
          });
        } else {
          step(index + 1);
        }
      }
    };
    step(0);
  }

  // When changing thing, also edit router.d.ts
  var NavigationFailureType = {
    redirected: 2,
    aborted: 4,
    cancelled: 8,
    duplicated: 16,
  };

  function createNavigationRedirectedError(from, to) {
    return createRouterError(
      from,
      to,
      NavigationFailureType.redirected,
      'Redirected when going from "' +
        from.fullPath +
        '" to "' +
        stringifyRoute(to) +
        '" via a navigation guard.'
    );
  }

  function createNavigationDuplicatedError(from, to) {
    var error = createRouterError(
      from,
      to,
      NavigationFailureType.duplicated,
      'Avoided redundant navigation to current location: "' +
        from.fullPath +
        '".'
    );
    // backwards compatible with the first introduction of Errors
    error.name = "NavigationDuplicated";
    return error;
  }

  function createNavigationCancelledError(from, to) {
    return createRouterError(
      from,
      to,
      NavigationFailureType.cancelled,
      'Navigation cancelled from "' +
        from.fullPath +
        '" to "' +
        to.fullPath +
        '" with a new navigation.'
    );
  }

  function createNavigationAbortedError(from, to) {
    return createRouterError(
      from,
      to,
      NavigationFailureType.aborted,
      'Navigation aborted from "' +
        from.fullPath +
        '" to "' +
        to.fullPath +
        '" via a navigation guard.'
    );
  }

  function createRouterError(from, to, type, message) {
    var error = new Error(message);
    error._isRouter = true;
    error.from = from;
    error.to = to;
    error.type = type;

    return error;
  }

  var propertiesToLog = ["params", "query", "hash"];

  function stringifyRoute(to) {
    if (typeof to === "string") {
      return to;
    }
    if ("path" in to) {
      return to.path;
    }
    var location = {};
    propertiesToLog.forEach(function (key) {
      if (key in to) {
        location[key] = to[key];
      }
    });
    return JSON.stringify(location, null, 2);
  }

  function isError(err) {
    return Object.prototype.toString.call(err).indexOf("Error") > -1;
  }

  function isNavigationFailure(err, errorType) {
    return (
      isError(err) &&
      err._isRouter &&
      (errorType == null || err.type === errorType)
    );
  }

  /*  */

  function resolveAsyncComponents(matched) {
    return function (to, from, next) {
      var hasAsync = false;
      var pending = 0;
      var error = null;

      flatMapComponents(matched, function (def, _, match, key) {
        // if it's a function and doesn't have cid attached,
        // assume it's an async component resolve function.
        // we are not using Vue's default async resolving mechanism because
        // we want to halt the navigation until the incoming component has been
        // resolved.
        if (typeof def === "function" && def.cid === undefined) {
          hasAsync = true;
          pending++;

          var resolve = once(function (resolvedDef) {
            if (isESModule(resolvedDef)) {
              resolvedDef = resolvedDef.default;
            }
            // save resolved on async factory in case it's used elsewhere
            def.resolved =
              typeof resolvedDef === "function"
                ? resolvedDef
                : _Vue.extend(resolvedDef);
            match.components[key] = resolvedDef;
            pending--;
            if (pending <= 0) {
              next();
            }
          });

          var reject = once(function (reason) {
            var msg =
              "Failed to resolve async component " + key + ": " + reason;
            warn(false, msg);
            if (!error) {
              error = isError(reason) ? reason : new Error(msg);
              next(error);
            }
          });

          var res;
          try {
            res = def(resolve, reject);
          } catch (e) {
            reject(e);
          }
          if (res) {
            if (typeof res.then === "function") {
              res.then(resolve, reject);
            } else {
              // new syntax in Vue 2.3
              var comp = res.component;
              if (comp && typeof comp.then === "function") {
                comp.then(resolve, reject);
              }
            }
          }
        }
      });

      if (!hasAsync) {
        next();
      }
    };
  }

  function flatMapComponents(matched, fn) {
    return flatten(
      matched.map(function (m) {
        return Object.keys(m.components).map(function (key) {
          return fn(m.components[key], m.instances[key], m, key);
        });
      })
    );
  }

  function flatten(arr) {
    return Array.prototype.concat.apply([], arr);
  }

  var hasSymbol =
    typeof Symbol === "function" && typeof Symbol.toStringTag === "symbol";

  function isESModule(obj) {
    return (
      obj.__esModule || (hasSymbol && obj[Symbol.toStringTag] === "Module")
    );
  }

  // in Webpack 2, require.ensure now also returns a Promise
  // so the resolve/reject functions may get called an extra time
  // if the user uses an arrow function shorthand that happens to
  // return that Promise.
  function once(fn) {
    var called = false;
    return function () {
      var args = [],
        len = arguments.length;
      while (len--) args[len] = arguments[len];

      if (called) {
        return;
      }
      called = true;
      return fn.apply(this, args);
    };
  }

  /*  */

  var History = function History(router, base) {
    this.router = router;
    this.base = normalizeBase(base);
    // start with a route object that stands for "nowhere"
    this.current = START;
    this.pending = null;
    this.ready = false;
    this.readyCbs = [];
    this.readyErrorCbs = [];
    this.errorCbs = [];
    this.listeners = [];
  };

  History.prototype.listen = function listen(cb) {
    this.cb = cb;
  };

  History.prototype.onReady = function onReady(cb, errorCb) {
    if (this.ready) {
      cb();
    } else {
      this.readyCbs.push(cb);
      if (errorCb) {
        this.readyErrorCbs.push(errorCb);
      }
    }
  };

  History.prototype.onError = function onError(errorCb) {
    this.errorCbs.push(errorCb);
  };

  History.prototype.transitionTo = function transitionTo(
    location,
    onComplete,
    onAbort
  ) {
    var this$1 = this;

    var route;
    // catch redirect option https://github.com/vuejs/vue-router/issues/3201
    try {
      route = this.router.match(location, this.current);
    } catch (e) {
      this.errorCbs.forEach(function (cb) {
        cb(e);
      });
      // Exception should still be thrown
      throw e;
    }
    var prev = this.current;
    this.confirmTransition(
      route,
      function () {
        this$1.updateRoute(route);
        onComplete && onComplete(route);
        this$1.ensureURL();
        this$1.router.afterHooks.forEach(function (hook) {
          hook && hook(route, prev);
        });

        // fire ready cbs once
        if (!this$1.ready) {
          this$1.ready = true;
          this$1.readyCbs.forEach(function (cb) {
            cb(route);
          });
        }
      },
      function (err) {
        if (onAbort) {
          onAbort(err);
        }
        if (err && !this$1.ready) {
          // Initial redirection should not mark the history as ready yet
          // because it's triggered by the redirection instead
          // https://github.com/vuejs/vue-router/issues/3225
          // https://github.com/vuejs/vue-router/issues/3331
          if (
            !isNavigationFailure(err, NavigationFailureType.redirected) ||
            prev !== START
          ) {
            this$1.ready = true;
            this$1.readyErrorCbs.forEach(function (cb) {
              cb(err);
            });
          }
        }
      }
    );
  };

  History.prototype.confirmTransition = function confirmTransition(
    route,
    onComplete,
    onAbort
  ) {
    var this$1 = this;

    var current = this.current;
    this.pending = route;
    var abort = function (err) {
      // changed after adding errors with
      // https://github.com/vuejs/vue-router/pull/3047 before that change,
      // redirect and aborted navigation would produce an err == null
      if (!isNavigationFailure(err) && isError(err)) {
        if (this$1.errorCbs.length) {
          this$1.errorCbs.forEach(function (cb) {
            cb(err);
          });
        } else {
          {
            warn(false, "uncaught error during route navigation:");
          }
          console.error(err);
        }
      }
      onAbort && onAbort(err);
    };
    var lastRouteIndex = route.matched.length - 1;
    var lastCurrentIndex = current.matched.length - 1;
    if (
      isSameRoute(route, current) &&
      // in the case the route map has been dynamically appended to
      lastRouteIndex === lastCurrentIndex &&
      route.matched[lastRouteIndex] === current.matched[lastCurrentIndex]
    ) {
      this.ensureURL();
      if (route.hash) {
        handleScroll(this.router, current, route, false);
      }
      return abort(createNavigationDuplicatedError(current, route));
    }

    var ref = resolveQueue(this.current.matched, route.matched);
    var updated = ref.updated;
    var deactivated = ref.deactivated;
    var activated = ref.activated;

    var queue = [].concat(
      // in-component leave guards
      extractLeaveGuards(deactivated),
      // global before hooks
      this.router.beforeHooks,
      // in-component update hooks
      extractUpdateHooks(updated),
      // in-config enter guards
      activated.map(function (m) {
        return m.beforeEnter;
      }),
      // async components
      resolveAsyncComponents(activated)
    );

    var iterator = function (hook, next) {
      if (this$1.pending !== route) {
        return abort(createNavigationCancelledError(current, route));
      }
      try {
        hook(route, current, function (to) {
          if (to === false) {
            // next(false) -> abort navigation, ensure current URL
            this$1.ensureURL(true);
            abort(createNavigationAbortedError(current, route));
          } else if (isError(to)) {
            this$1.ensureURL(true);
            abort(to);
          } else if (
            typeof to === "string" ||
            (typeof to === "object" &&
              (typeof to.path === "string" || typeof to.name === "string"))
          ) {
            // next('/') or next({ path: '/' }) -> redirect
            abort(createNavigationRedirectedError(current, route));
            if (typeof to === "object" && to.replace) {
              this$1.replace(to);
            } else {
              this$1.push(to);
            }
          } else {
            // confirm transition and pass on the value
            next(to);
          }
        });
      } catch (e) {
        abort(e);
      }
    };

    runQueue(queue, iterator, function () {
      // wait until async components are resolved before
      // extracting in-component enter guards
      var enterGuards = extractEnterGuards(activated);
      var queue = enterGuards.concat(this$1.router.resolveHooks);
      runQueue(queue, iterator, function () {
        if (this$1.pending !== route) {
          return abort(createNavigationCancelledError(current, route));
        }
        this$1.pending = null;
        onComplete(route);
        if (this$1.router.app) {
          this$1.router.app.$nextTick(function () {
            handleRouteEntered(route);
          });
        }
      });
    });
  };

  History.prototype.updateRoute = function updateRoute(route) {
    this.current = route;
    this.cb && this.cb(route);
  };

  History.prototype.setupListeners = function setupListeners() {
    // Default implementation is empty
  };

  History.prototype.teardown = function teardown() {
    // clean up event listeners
    // https://github.com/vuejs/vue-router/issues/2341
    this.listeners.forEach(function (cleanupListener) {
      cleanupListener();
    });
    this.listeners = [];

    // reset current history route
    // https://github.com/vuejs/vue-router/issues/3294
    this.current = START;
    this.pending = null;
  };

  function normalizeBase(base) {
    if (!base) {
      if (inBrowser) {
        // respect <base> tag
        var baseEl = document.querySelector("base");
        base = (baseEl && baseEl.getAttribute("href")) || "/";
        // strip full URL origin
        base = base.replace(/^https?:\/\/[^\/]+/, "");
      } else {
        base = "/";
      }
    }
    // make sure there's the starting slash
    if (base.charAt(0) !== "/") {
      base = "/" + base;
    }
    // remove trailing slash
    return base.replace(/\/$/, "");
  }

  function resolveQueue(current, next) {
    var i;
    var max = Math.max(current.length, next.length);
    for (i = 0; i < max; i++) {
      if (current[i] !== next[i]) {
        break;
      }
    }
    return {
      updated: next.slice(0, i),
      activated: next.slice(i),
      deactivated: current.slice(i),
    };
  }

  function extractGuards(records, name, bind, reverse) {
    var guards = flatMapComponents(
      records,
      function (def, instance, match, key) {
        var guard = extractGuard(def, name);
        if (guard) {
          return Array.isArray(guard)
            ? guard.map(function (guard) {
                return bind(guard, instance, match, key);
              })
            : bind(guard, instance, match, key);
        }
      }
    );
    return flatten(reverse ? guards.reverse() : guards);
  }

  function extractGuard(def, key) {
    if (typeof def !== "function") {
      // extend now so that global mixins are applied.
      def = _Vue.extend(def);
    }
    return def.options[key];
  }

  function extractLeaveGuards(deactivated) {
    return extractGuards(deactivated, "beforeRouteLeave", bindGuard, true);
  }

  function extractUpdateHooks(updated) {
    return extractGuards(updated, "beforeRouteUpdate", bindGuard);
  }

  function bindGuard(guard, instance) {
    if (instance) {
      return function boundRouteGuard() {
        return guard.apply(instance, arguments);
      };
    }
  }

  function extractEnterGuards(activated) {
    return extractGuards(
      activated,
      "beforeRouteEnter",
      function (guard, _, match, key) {
        return bindEnterGuard(guard, match, key);
      }
    );
  }

  function bindEnterGuard(guard, match, key) {
    return function routeEnterGuard(to, from, next) {
      return guard(to, from, function (cb) {
        if (typeof cb === "function") {
          if (!match.enteredCbs[key]) {
            match.enteredCbs[key] = [];
          }
          match.enteredCbs[key].push(cb);
        }
        next(cb);
      });
    };
  }

  /*  */

  var HTML5History = /*@__PURE__*/ (function (History) {
    function HTML5History(router, base) {
      History.call(this, router, base);

      this._startLocation = getLocation(this.base);
    }

    if (History) HTML5History.__proto__ = History;
    HTML5History.prototype = Object.create(History && History.prototype);
    HTML5History.prototype.constructor = HTML5History;

    HTML5History.prototype.setupListeners = function setupListeners() {
      var this$1 = this;

      if (this.listeners.length > 0) {
        return;
      }

      var router = this.router;
      var expectScroll = router.options.scrollBehavior;
      var supportsScroll = supportsPushState && expectScroll;

      if (supportsScroll) {
        this.listeners.push(setupScroll());
      }

      var handleRoutingEvent = function () {
        var current = this$1.current;

        // Avoiding first `popstate` event dispatched in some browsers but first
        // history route not updated since async guard at the same time.
        var location = getLocation(this$1.base);
        if (this$1.current === START && location === this$1._startLocation) {
          return;
        }

        this$1.transitionTo(location, function (route) {
          if (supportsScroll) {
            handleScroll(router, route, current, true);
          }
        });
      };
      window.addEventListener("popstate", handleRoutingEvent);
      this.listeners.push(function () {
        window.removeEventListener("popstate", handleRoutingEvent);
      });
    };

    HTML5History.prototype.go = function go(n) {
      window.history.go(n);
    };

    HTML5History.prototype.push = function push(location, onComplete, onAbort) {
      var this$1 = this;

      var ref = this;
      var fromRoute = ref.current;
      this.transitionTo(
        location,
        function (route) {
          pushState(cleanPath(this$1.base + route.fullPath));
          handleScroll(this$1.router, route, fromRoute, false);
          onComplete && onComplete(route);
        },
        onAbort
      );
    };

    HTML5History.prototype.replace = function replace(
      location,
      onComplete,
      onAbort
    ) {
      var this$1 = this;

      var ref = this;
      var fromRoute = ref.current;
      this.transitionTo(
        location,
        function (route) {
          replaceState(cleanPath(this$1.base + route.fullPath));
          handleScroll(this$1.router, route, fromRoute, false);
          onComplete && onComplete(route);
        },
        onAbort
      );
    };

    HTML5History.prototype.ensureURL = function ensureURL(push) {
      if (getLocation(this.base) !== this.current.fullPath) {
        var current = cleanPath(this.base + this.current.fullPath);
        push ? pushState(current) : replaceState(current);
      }
    };

    HTML5History.prototype.getCurrentLocation = function getCurrentLocation() {
      return getLocation(this.base);
    };

    return HTML5History;
  })(History);

  function getLocation(base) {
    var path = window.location.pathname;
    var pathLowerCase = path.toLowerCase();
    var baseLowerCase = base.toLowerCase();
    // base="/a" shouldn't turn path="/app" into "/a/pp"
    // https://github.com/vuejs/vue-router/issues/3555
    // so we ensure the trailing slash in the base
    if (
      base &&
      (pathLowerCase === baseLowerCase ||
        pathLowerCase.indexOf(cleanPath(baseLowerCase + "/")) === 0)
    ) {
      path = path.slice(base.length);
    }
    return (path || "/") + window.location.search + window.location.hash;
  }

  /*  */

  var HashHistory = /*@__PURE__*/ (function (History) {
    function HashHistory(router, base, fallback) {
      History.call(this, router, base);
      // check history fallback deeplinking
      if (fallback && checkFallback(this.base)) {
        return;
      }
      ensureSlash();
    }

    if (History) HashHistory.__proto__ = History;
    HashHistory.prototype = Object.create(History && History.prototype);
    HashHistory.prototype.constructor = HashHistory;

    // this is delayed until the app mounts
    // to avoid the hashchange listener being fired too early
    HashHistory.prototype.setupListeners = function setupListeners() {
      var this$1 = this;

      if (this.listeners.length > 0) {
        return;
      }

      var router = this.router;
      var expectScroll = router.options.scrollBehavior;
      var supportsScroll = supportsPushState && expectScroll;

      if (supportsScroll) {
        this.listeners.push(setupScroll());
      }

      var handleRoutingEvent = function () {
        var current = this$1.current;
        if (!ensureSlash()) {
          return;
        }
        this$1.transitionTo(getHash(), function (route) {
          if (supportsScroll) {
            handleScroll(this$1.router, route, current, true);
          }
          if (!supportsPushState) {
            replaceHash(route.fullPath);
          }
        });
      };
      var eventType = supportsPushState ? "popstate" : "hashchange";
      window.addEventListener(eventType, handleRoutingEvent);
      this.listeners.push(function () {
        window.removeEventListener(eventType, handleRoutingEvent);
      });
    };

    HashHistory.prototype.push = function push(location, onComplete, onAbort) {
      var this$1 = this;

      var ref = this;
      var fromRoute = ref.current;
      this.transitionTo(
        location,
        function (route) {
          pushHash(route.fullPath);
          handleScroll(this$1.router, route, fromRoute, false);
          onComplete && onComplete(route);
        },
        onAbort
      );
    };

    HashHistory.prototype.replace = function replace(
      location,
      onComplete,
      onAbort
    ) {
      var this$1 = this;

      var ref = this;
      var fromRoute = ref.current;
      this.transitionTo(
        location,
        function (route) {
          replaceHash(route.fullPath);
          handleScroll(this$1.router, route, fromRoute, false);
          onComplete && onComplete(route);
        },
        onAbort
      );
    };

    HashHistory.prototype.go = function go(n) {
      window.history.go(n);
    };

    HashHistory.prototype.ensureURL = function ensureURL(push) {
      var current = this.current.fullPath;
      if (getHash() !== current) {
        push ? pushHash(current) : replaceHash(current);
      }
    };

    HashHistory.prototype.getCurrentLocation = function getCurrentLocation() {
      return getHash();
    };

    return HashHistory;
  })(History);

  function checkFallback(base) {
    var location = getLocation(base);
    if (!/^\/#/.test(location)) {
      window.location.replace(cleanPath(base + "/#" + location));
      return true;
    }
  }

  function ensureSlash() {
    var path = getHash();
    if (path.charAt(0) === "/") {
      return true;
    }
    replaceHash("/" + path);
    return false;
  }

  function getHash() {
    // We can't use window.location.hash here because it's not
    // consistent across browsers - Firefox will pre-decode it!
    var href = window.location.href;
    var index = href.indexOf("#");
    // empty path
    if (index < 0) {
      return "";
    }

    href = href.slice(index + 1);

    return href;
  }

  function getUrl(path) {
    var href = window.location.href;
    var i = href.indexOf("#");
    var base = i >= 0 ? href.slice(0, i) : href;
    return base + "#" + path;
  }

  function pushHash(path) {
    if (supportsPushState) {
      pushState(getUrl(path));
    } else {
      window.location.hash = path;
    }
  }

  function replaceHash(path) {
    if (supportsPushState) {
      replaceState(getUrl(path));
    } else {
      window.location.replace(getUrl(path));
    }
  }

  /*  */

  var AbstractHistory = /*@__PURE__*/ (function (History) {
    function AbstractHistory(router, base) {
      History.call(this, router, base);
      this.stack = [];
      this.index = -1;
    }

    if (History) AbstractHistory.__proto__ = History;
    AbstractHistory.prototype = Object.create(History && History.prototype);
    AbstractHistory.prototype.constructor = AbstractHistory;

    AbstractHistory.prototype.push = function push(
      location,
      onComplete,
      onAbort
    ) {
      var this$1 = this;

      this.transitionTo(
        location,
        function (route) {
          this$1.stack = this$1.stack.slice(0, this$1.index + 1).concat(route);
          this$1.index++;
          onComplete && onComplete(route);
        },
        onAbort
      );
    };

    AbstractHistory.prototype.replace = function replace(
      location,
      onComplete,
      onAbort
    ) {
      var this$1 = this;

      this.transitionTo(
        location,
        function (route) {
          this$1.stack = this$1.stack.slice(0, this$1.index).concat(route);
          onComplete && onComplete(route);
        },
        onAbort
      );
    };

    AbstractHistory.prototype.go = function go(n) {
      var this$1 = this;

      var targetIndex = this.index + n;
      if (targetIndex < 0 || targetIndex >= this.stack.length) {
        return;
      }
      var route = this.stack[targetIndex];
      this.confirmTransition(
        route,
        function () {
          var prev = this$1.current;
          this$1.index = targetIndex;
          this$1.updateRoute(route);
          this$1.router.afterHooks.forEach(function (hook) {
            hook && hook(route, prev);
          });
        },
        function (err) {
          if (isNavigationFailure(err, NavigationFailureType.duplicated)) {
            this$1.index = targetIndex;
          }
        }
      );
    };

    AbstractHistory.prototype.getCurrentLocation =
      function getCurrentLocation() {
        var current = this.stack[this.stack.length - 1];
        return current ? current.fullPath : "/";
      };

    AbstractHistory.prototype.ensureURL = function ensureURL() {
      // noop
    };

    return AbstractHistory;
  })(History);

  /*  */

  var VueRouter = function VueRouter(options) {
    if (options === void 0) options = {};

    {
      warn(
        this instanceof VueRouter,
        "Router must be called with the new operator."
      );
    }
    this.app = null;
    this.apps = [];
    this.options = options;
    this.beforeHooks = [];
    this.resolveHooks = [];
    this.afterHooks = [];
    this.matcher = createMatcher(options.routes || [], this);

    var mode = options.mode || "hash";
    this.fallback =
      mode === "history" && !supportsPushState && options.fallback !== false;
    if (this.fallback) {
      mode = "hash";
    }
    if (!inBrowser) {
      mode = "abstract";
    }
    this.mode = mode;

    switch (mode) {
      case "history":
        this.history = new HTML5History(this, options.base);
        break;
      case "hash":
        this.history = new HashHistory(this, options.base, this.fallback);
        break;
      case "abstract":
        this.history = new AbstractHistory(this, options.base);
        break;
      default: {
        assert(false, "invalid mode: " + mode);
      }
    }
  };

  var prototypeAccessors = { currentRoute: { configurable: true } };

  VueRouter.prototype.match = function match(raw, current, redirectedFrom) {
    return this.matcher.match(raw, current, redirectedFrom);
  };

  prototypeAccessors.currentRoute.get = function () {
    return this.history && this.history.current;
  };

  VueRouter.prototype.init = function init(app /* Vue component instance */) {
    var this$1 = this;

    assert(
      install.installed,
      "not installed. Make sure to call `Vue.use(VueRouter)` " +
        "before creating root instance."
    );

    this.apps.push(app);

    // set up app destroyed handler
    // https://github.com/vuejs/vue-router/issues/2639
    app.$once("hook:destroyed", function () {
      // clean out app from this.apps array once destroyed
      var index = this$1.apps.indexOf(app);
      if (index > -1) {
        this$1.apps.splice(index, 1);
      }
      // ensure we still have a main app or null if no apps
      // we do not release the router so it can be reused
      if (this$1.app === app) {
        this$1.app = this$1.apps[0] || null;
      }

      if (!this$1.app) {
        this$1.history.teardown();
      }
    });

    // main app previously initialized
    // return as we don't need to set up new history listener
    if (this.app) {
      return;
    }

    this.app = app;

    var history = this.history;

    if (history instanceof HTML5History || history instanceof HashHistory) {
      var handleInitialScroll = function (routeOrError) {
        var from = history.current;
        var expectScroll = this$1.options.scrollBehavior;
        var supportsScroll = supportsPushState && expectScroll;

        if (supportsScroll && "fullPath" in routeOrError) {
          handleScroll(this$1, routeOrError, from, false);
        }
      };
      var setupListeners = function (routeOrError) {
        history.setupListeners();
        handleInitialScroll(routeOrError);
      };
      history.transitionTo(
        history.getCurrentLocation(),
        setupListeners,
        setupListeners
      );
    }

    history.listen(function (route) {
      this$1.apps.forEach(function (app) {
        app._route = route;
      });
    });
  };

  VueRouter.prototype.beforeEach = function beforeEach(fn) {
    return registerHook(this.beforeHooks, fn);
  };

  VueRouter.prototype.beforeResolve = function beforeResolve(fn) {
    return registerHook(this.resolveHooks, fn);
  };

  VueRouter.prototype.afterEach = function afterEach(fn) {
    return registerHook(this.afterHooks, fn);
  };

  VueRouter.prototype.onReady = function onReady(cb, errorCb) {
    this.history.onReady(cb, errorCb);
  };

  VueRouter.prototype.onError = function onError(errorCb) {
    this.history.onError(errorCb);
  };

  VueRouter.prototype.push = function push(location, onComplete, onAbort) {
    var this$1 = this;

    // $flow-disable-line
    if (!onComplete && !onAbort && typeof Promise !== "undefined") {
      return new Promise(function (resolve, reject) {
        this$1.history.push(location, resolve, reject);
      });
    } else {
      this.history.push(location, onComplete, onAbort);
    }
  };

  VueRouter.prototype.replace = function replace(
    location,
    onComplete,
    onAbort
  ) {
    var this$1 = this;

    // $flow-disable-line
    if (!onComplete && !onAbort && typeof Promise !== "undefined") {
      return new Promise(function (resolve, reject) {
        this$1.history.replace(location, resolve, reject);
      });
    } else {
      this.history.replace(location, onComplete, onAbort);
    }
  };

  VueRouter.prototype.go = function go(n) {
    this.history.go(n);
  };

  VueRouter.prototype.back = function back() {
    this.go(-1);
  };

  VueRouter.prototype.forward = function forward() {
    this.go(1);
  };

  VueRouter.prototype.getMatchedComponents = function getMatchedComponents(to) {
    var route = to
      ? to.matched
        ? to
        : this.resolve(to).route
      : this.currentRoute;
    if (!route) {
      return [];
    }
    return [].concat.apply(
      [],
      route.matched.map(function (m) {
        return Object.keys(m.components).map(function (key) {
          return m.components[key];
        });
      })
    );
  };

  VueRouter.prototype.resolve = function resolve(to, current, append) {
    current = current || this.history.current;
    var location = normalizeLocation(to, current, append, this);
    var route = this.match(location, current);
    var fullPath = route.redirectedFrom || route.fullPath;
    var base = this.history.base;
    var href = createHref(base, fullPath, this.mode);
    return {
      location: location,
      route: route,
      href: href,
      // for backwards compat
      normalizedTo: location,
      resolved: route,
    };
  };

  VueRouter.prototype.getRoutes = function getRoutes() {
    return this.matcher.getRoutes();
  };

  VueRouter.prototype.addRoute = function addRoute(parentOrRoute, route) {
    this.matcher.addRoute(parentOrRoute, route);
    if (this.history.current !== START) {
      this.history.transitionTo(this.history.getCurrentLocation());
    }
  };

  VueRouter.prototype.addRoutes = function addRoutes(routes) {
    {
      warn(
        false,
        "router.addRoutes() is deprecated and has been removed in Vue Router 4. Use router.addRoute() instead."
      );
    }
    this.matcher.addRoutes(routes);
    if (this.history.current !== START) {
      this.history.transitionTo(this.history.getCurrentLocation());
    }
  };

  Object.defineProperties(VueRouter.prototype, prototypeAccessors);

  function registerHook(list, fn) {
    list.push(fn);
    return function () {
      var i = list.indexOf(fn);
      if (i > -1) {
        list.splice(i, 1);
      }
    };
  }

  function createHref(base, fullPath, mode) {
    var path = mode === "hash" ? "#" + fullPath : fullPath;
    return base ? cleanPath(base + "/" + path) : path;
  }

  VueRouter.install = install;
  VueRouter.version = "3.5.3";
  VueRouter.isNavigationFailure = isNavigationFailure;
  VueRouter.NavigationFailureType = NavigationFailureType;
  VueRouter.START_LOCATION = START;

  if (inBrowser && window.Vue) {
    window.Vue.use(VueRouter);
  }

  return VueRouter;
});
